OpcCmd uaClient command tips and tricks

How do I specify a connection using ECC security policy?

Example:

OpcCmd uaClient read opc.tcp://pc-zbynekz-5:62541/Quickstarts/ReferenceServer --EndpointSecurityPolicyDisplayName ECC_nistP256 i=2255

For other ECC policies, use e.g. ECC_nistP384, ECC_brainpoolP256r1 or ECC_brainpoolP384r1.

How can I check which message security mode, or security policy, is actually being used?

Start the uaClient command as follows:

!option AmbientOutput [Boolean]True
uaclient --ConnectionMonitoring

Then, proceed as normally. There will be ServerConditionChanged events displayed, and in their Connected state, they will show the communication profile (in angle brackets) being used, e.g.:

[1] IEasyUAClientConnectionMonitoring.ServerConditionChanged: "opc.tcp://localhost:48040 - [SignAndEncrypt:ECC-nistP256:Binary]" Connected; Success

In this example, the message security mode is SignAndEncrypt, the security policy name is ECC-nistP256, and the data encoding name is Binary.